Either one is right really.
Personally, I concur with you, and would rather write the feds a check in April as I will be again this year, $49 to be exact
In reality in today's rate environment, you will nto make a hill of beans on interest on that money, but it is your money, so why should you have to wait to have it to do as you please?
I know others who cannot save, and your dad's way is a forced savings plan for them, and they like getting a nice big chuck of cash each spring. They use this to pay off christmas bills, take a vacation, deposit it into their IRA, etc...
You are correct though, either way you do it, you are still paying the feds the same in the long run.